Realtek Semiconductor Inc.

Yu-Nan Lin

Wei-Hsuan Chang

Kuang-Yu Yen

Wei-Chi Lai

Shen-Chung Lee

Chung-Yao Chang

Der-Zheng Liu

Wen-Yung Lee

Tzu-Hao Tai

Yin-Shao Chang

Chih-Heng Tsai

Chi-Fang Chang

A wireless communication device for a transmission end of a wireless communication system is provided. The wireless communication device includes a wireless analog transmission unit, for transmitting a data packet on a data transmission channel; and a packet generating unit, for generating the data packet and at least one protection packet; wherein before transmitting the data packet on the data transmission channel, the wireless communication device transmits the at least one protection packet on at least one adjacent channel of the data transmission channel to indicate to at least one user of the at least one adjacent channel to stop using the at least one adjacent channel before transmission of the data packet is completed, and at least one frequency band of the at least one adjacent channel overlaps a frequency band of the data transmission channel.

Wireless communication device and packet protection method thereof

A communication device includes a radio transceiver and a collision detection device. The radio transceiver is configured to receive a wireless signal which includes an acknowledgment packet from a wireless communication channel. The acknowledgment packet includes acknowledgment information which corresponds to a plurality of transmitted packets. The collision detection device is coupled to the radio transceiver and configured to receive the acknowledgment packet, determine whether collision has occurred in the wireless communication channel according to the acknowledgment information corresponding to the transmitted packets and accordingly generate a detection result. The collision detection device determines whether collision has occurred according to a distribution of the acknowledgment information having a predetermined acknowledgment status. When the collision detection device determines that the acknowledgment information having the predetermined acknowledgment status is concentrated in a section of the acknowledgment packet, the detection result indicates that collision has occurred.

Communication device and collision detection method

This invention discloses a method for controlling a wireless communication device to reduce the number of retry times of data packets during transmission. The method includes steps of: using a first packet length to generate and transmit data packets; counting retry times of data packets in a predetermined time period and generating a result accordingly; and using a second packet length smaller than said first packet length to generate and transmit data packets when said result is greater than a predetermined value.

Wireless communication device and method of controlling same

A method and apparatus for performing dynamic statistical period adjustment regarding rate adaption (RA) are provided. The method includes: collecting respective transmission results of multiple data packets to perform parallel processing, where the parallel processing includes statistical period control and RA control. The statistical period control includes: determining whether a first loop index reaches a monitored period threshold; performing first transmitting (TX) information statistics; calculating variance of TX information statistics results; and selectively adjusting a statistical period threshold. The RA control includes: determining whether a second loop index reaches the statistical period threshold; performing second TX information statistics; and performing the RA. The statistical period control may dynamically adjust the statistical period of the RA control, to enhance transmission efficiency of the wireless communications device.

Method and apparatus for performing dynamic statistical period adjustment regarding rate adaption

This invention discloses a method for controlling a wireless communication device to transmit data packets. The method includes steps of: transmitting data packets; counting retry times of data packets in a predetermined time period and generating a result accordingly; comparing said result with a predetermined value and generating a comparison result accordingly; and reducing transmission time of data packets according to said comparison result.

The present invention discloses a gain adjustment method for wireless communication. This method is carried out by a wireless transceiver, and an embodiment of the method comprises the following steps: obtaining at least one transceiving parameter of a wireless connection partner; determining an adaptive power gain according to the at least one transceiving parameter; having an idle power gain of a radio-frequency circuit of the wireless transceiver be the adaptive power gain for a period of time, or having the idle power gain of the radio-frequency circuit be the adaptive power gain until packet transmission operation or packet reception operation takes place within the period of time; and if none of the packet transmission operation and the packet reception operation takes place within the period of time, having the idle power gain of the radio-frequency circuit be an initial power gain right after the period of time.

Gain adjustment method for wireless communication

A wireless receiver includes a radio frequency (RF) receiving unit and a baseband receiving unit. A first path of the RF receiving includes a first filter, and is arranged for receiving an input RF signal and generating a first baseband input signal; a second path is arranged for receiving the input RF signal and generating a second baseband input signal. The baseband receiving unit is arranged for receiving the first baseband input signal and the second baseband input signal to generate a baseband decoded signal. One of the first path and the second path is an in-phase path, and the other is a quadrature-phase path. When the RF receiving unit operates in a first mode, the RF receiving unit only uses the first path to receive the input RF signal.

Wireless receiver and method for wireless reception

A transmitting method and transmission system using the same is applied to selectively use a space block-coding module to transmit a transmitted data. Each data stream of the transmission data is transmitted using the transmitting paths, and the transmission qualities of the transmitting paths are detected to decide whether the space-block encoding module works or not.

Transmitting method and transmission system using the same

A selecting apparatus for receiving antennas of a Multiple Input Multiple Output wireless system and a method thereof are disclosed. The method for selecting antennas includes the following steps. Select a set of receiving antenna sequentially by a selective and control unit so as to receive an input data. Then a signal processing module deals with the input data to generate output data sets. An operation unit processes at least one of the multiple sets of output data for generating a detection data that is sent to a determining unit. According to the detection data, the determining unit generates a control signal that is sent to the selective and control unit for driving the selective and control unit to select a set of antenna to be used.

Selecting apparatus for receiving antenna of multiple input multiple output wireless system and method thereof

A transmit diversity method applied to a transmitting system includes the steps of: receiving a serial stream, and transforming the serial stream into a plurality of parallel streams, wherein each parallel stream is carried by a corresponding sub-carrier; and in light of each sub-carrier, selecting a single transmission path from at least two transmission paths of the transmitting system so as to transmit the parallel stream carried by the sub-carrier. The transmit diversity method further includes the step of: dividing the plurality of parallel streams carried by the sub-carries into M groups, wherein the parallel streams belonging to the same group are transmitted via selecting the same transmission path.

Transmit diversity method applied to a transmitting system and transmitting system having multi-transmission paths thereof

A spread spectrum communication system includes a first and a second antenna, a first and a second radio frequency demodulator, a first and a second analog-to-digital converter, a first and a second filter, a clear channel assessment device, and a selection device. The radio frequency demodulators convert radio frequency signals to baseband signals, respectively. The analog-to-digital converters convert baseband signals to digital signals, respectively. The filters filter the first and second digital signals to generate filtered signals, respectively. The clear channel assessment device generates a channel assessment signal and a path selection signal according to signal characteristics of the filtered signals. The selection device refers to at least one of the channel assessment signal and path selection signal to selectively output one of the filtered signals, or generate no signal output.

Spread spectrum communication system, clear channel assessment device and related method

A signal transmission method includes: converting an input signal to generate a first converted signal having a first bandwidth, and a second converted signal having a second bandwidth; mixing the first converted signal with an oscillation signal to generate a first mixed signal, and mixing the second converted signal with the oscillation signal to generate a second mixed signal; and transmitting the first and second mixed signals by different antennas; wherein the input signal has a predetermined bandwidth, the first bandwidth is smaller than the predetermined bandwidth; and the second bandwidth is smaller than the predetermined bandwidth.

Transmitter and transmission method thereof

A beam-forming apparatus applied in a Multiple Input Multiple Output (MIMO) system and a related method where the MIMO system transmits signals through a plurality of channels. The method includes generating a plurality of channel estimations corresponding to the channels; determining a plurality of first candidate transmitting vectors; selecting a first transmitting vector from the first candidate transmitting vectors according to the channel estimations; determining a plurality of second candidate transmitting vectors orthogonal to the first transmitting vector; selecting a second transmitting vector from the second candidate transmitting vectors according to the channel estimations; generating a plurality of transmitted signals by combining a first data stream and a second data stream according to the first and second transmitting vectors; and respectively transmitting the transmitted signals through a plurality of antennas. The apparatus ensures that power of a data stream is distributed equally for each antenna.

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Hsinchu, Taiwan

Yu-Nan Lin